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Share Based Compensation - Additional Information (Detail) kr / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2024 SEK (kr) shares Employee Country kr / shares | Dec. 31, 2023 SEK (kr) Participants Employee Country | Dec. 31, 2022 USD ($) Employee Participants | Dec. 31, 2021 Employee | Dec. 31, 2016 kr / shares shares
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Total compensation expense | kr 4,257,000,000 |  |  |  |
share price at vesting | kr / shares | kr 55.63 |  |  |  |
Payout amount at vesting | kr 632,200,000 |  |  |  |
Exercise price, share options granted | kr / shares | kr 68.62 |  |  |  |
Reporting year [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Total compensation expense | kr 2,073,000,000 | kr 1,371,000,000 |  |  |
Provisions for cash settled plans | 2,992,000,000 | 1,584,000,000 |  |  |
Social Charges included in the provision for cash-settled plans | kr 272,000,000 | 153,000,000 |  |  |
No compensation expenses recognized during the period | six-year |  |  |  |
Purchased call options [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Purchase of options shares | shares |  |  |  |  | 1,000,000
Net proceeds from share options | kr / shares | kr 2.44 |  |  |  |
Number of share options exercised in share-based payment arrangement | shares | 2,000,000 |  |  |  |
Purchase of options shares | shares |  |  |  |  | 2,000,000
Purchase price of share options | kr / shares |  |  |  |  | kr 0.49
No compensation expenses recognized during the period |  |  |  |  | seven-year period
Option extended exercise period | 1 year |  |  |  |
Option exercise period | 1 year |  |  |  |
Purchased call options [member] | Jan Carlson [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Purchase of options shares | shares | 132,538 |  |  |  |
Purchase price of share options | kr / shares | kr 15.09 |  |  |  |
Key contributor retention plan [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Compensation expense of cash settlement | kr 1,953,000,000 | 1,250,000,000 |  |  |
Executive performance plan [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Compensation expense of cash settlement | kr 27,000,000 | kr 39,000,000 |  |  |
Executive Performance Plan 2021 [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Number of senior managers who selected for plan | Employee |  |  |  | 159 |
Ericsson Share Purchase Plan [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Number of countries launched the plan | Country | 69 | 69 |  |  |
Cash payment percentage out of contribution amount | 15.00% |  |  |  |
Number of eligible employees | Employee | 76,000 |  |  |  |
Maximum value of yearly purchase of Ericsson B-shares | kr 55,000 |  |  |  |
Key Contributor Plan 2023 [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Vesting period |  | 2 years |  |  |
Number of employees who selected for plan | Participants |  | 87 |  |  |
Executive Performance Plan 2022 [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Number of senior managers who selected for plan | Employee |  |  | 165 |  |
Senior Managers [member] | Executive performance plan [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Vesting period | 3 years |  |  |  |
Retention Of Key Employees [member] | Key Contributor Plan 2021 [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Number of awards |  |  |  | There are three award levels at 10%, 25% and 30% of the participants’ annual gross salary. |
Vesting period |  |  |  | 3 years |
Number of employees who selected for plan | Employee |  |  |  | 7,246 |
Retention Of Key Employees [member] | Key Contributor Plan 2019 [member] | 2023 [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage of award to be paid | 25.00% |  |  |  |
Retention Of Key Employees [member] | Key Contributor Plan 2019 [member] | 2024 [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage of award to be paid | 25.00% |  |  |  |
Retention Of Key Employees [member] | Key Contributor Plan 2019 [member] | 2025 [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage of award to be paid | 50.00% |  |  |  |
Retention Of Key Employees [member] | Key Contributor Plan 2024 [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Number of awards | there are multiple levels between 10%–50% of the participants’ annual gross salary (deviation exists in legal entities Vonage). The total service period is three years, however the payout is distributed over the entire service period with staggered payments as explained under Key Contributor Plans (KC Plans). |  |  |  |
Vesting period | 3 years |  |  |  |
Number of employees who selected for plan | Employee | 9,538 |  |  |  |
Retention Of Key Employees [member] | Key Contributor Plan 2023 [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Vesting description |  | vesting is 50%/50% on each annual anniversary. |  |  |
Number of awards |  | There are multiple levels between 10%–50% of the participants’ annual gross salary. The total service period is three years, however the payout is distributed over the entire service period with staggered payments as explained under Key Contributor Plans (KC Plans). |  |  |
Vesting period |  | 3 years |  |  |
Number of employees who selected for plan | Employee |  | 10,154 |  |  |
Retention Of Key Employees [member] | Key Contributor Plan 2022 [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Number of awards |  |  | There are at multiple levels between 10%–40% of the participants’ annual gross salary. The total service period is three years, however the payout is distributed over the entire service period with staggered payments as explained under Key Contributor Plans (KC Plans). |  |
Vesting period |  |  | 3 years |  |
Number of employees who selected for plan | Employee |  |  | 7,704 |  |
Performance share awards [member] | The President and CEO [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage value of awards on annual base salary |  | 190.00% |  | 190.00% |
Performance share awards [member] | Other participants [member] | Bottom of range [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage value of awards on annual base salary | 10.00% | 10.00% | 30.00% | 30.00% |
Performance share awards [member] | Other participants [member] | Top of range [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage value of awards on annual base salary | 100.00% | 70.00% | 70.00% | 70.00% |
The President and CEO and The ET [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Compensation expense charged | kr 93,000,000 | kr 82,000,000 |  |  |
The President and CEO and The ET [member] | Performance share awards [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage value of awards on annual base salary | 150.00% |  |  |  |
Long-term variable compensation program [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Vesting period | 3 years |  |  |  |
Long-term variable compensation program [member] | Performance share awards [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Vesting description | Awards under LTV (Performance Share Awards) are granted to the participants, provided that certain performance conditions are met, to receive a number of shares, free of charge, following expiration of a three-year vesting period (vesting period). |  |  |  |
Vesting period | 3 years |  |  |  |
Cash Settled Plans [Member] | Key Contributor Plan 2022 [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Vesting period |  |  | 2 years |  |
Value of award to be paid | $ |  |  | $ 4.8 |  |
Number of participants with cash-settled retention plan | Participants |  |  | 95 |  |
Cash Settled Plans [Member] | Key Contributor Plan 2022 [Member] | 2023 [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage of award to be paid |  |  | 50.00% |  |
Cash Settled Plans [Member] | Key Contributor Plan 2022 [Member] | 2024 [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage of award to be paid |  |  | 50.00% |  |
Rest of the Countries [Member] | Executive Performance Plan 2022 [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage of regular award level |  |  | 15.00% |  |
Percentage of high award level |  |  | 25.00% |  |
All Countries Except USA [member] | Executive Performance Plan 2021 [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage of regular award level |  |  |  | 15.00% |
Percentage of high award level |  |  |  | 25.00% |
US [member] | Key Contributor Plan 2021 [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage of high award level |  |  |  | 35.00% |
US [member] | Executive Performance Plan 2021 [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage of regular award level |  |  |  | 25.00% |
US [member] | Executive Performance Plan 2022 [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage of regular award level |  |  | 35.00% |  |
CA [Member] | Executive Performance Plan 2022 [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage of high award level |  |  | 45.00% |  |

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